2.091/(0.785×(0.039^2)×10.75)
    12/√1.246
    (12.87/7528.73)^(2/3)×10.224
    0.08046×(√1021.9058)
    -90-arctan(0.8/0.1)-arctan(0.8/10)
    -90-arctan(0.9/0.1)-arctan(0.9/10)
    -90-arctan(1/0.1)-arctan(1/10)
    -90-arctan(0.995/0.1)-arctan(0.995/10)
    0.6540×(60.5^0.25)+0.346×(16.094^0.25)
    0.2731×62.591^0.25
    4x^2-35x-105=0
    X+X*2.38*1.2=10000
    1300-((50+31.6×3+(18.4×3)/2+31.6/2)+ (56 +25.1/2+18.4/2))
    4362-(1300/2-(50+31.6×3+18.4/2+31.6/2))
    1300-((50+31.6×3+18.4/2+31.6/2)+ (56 +18.4/2+18.4/2))
    2/3x^3-2x^2+8/3=0
    555454x=464656
    x*ln(x)+17.1*x+3108264.07 = 0
    -1.3×(140×2)/(4×3.56)×(0.86-0.84/4)
    5/48*((565.55*10^6*15500^2)/(6.32*10^15))*1.60

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